Return to KLUBNL.PL main page

rsgb_lf_group
[Top] [All Lists]
<prev [Date] next>
[Advanced]
 <prev [Thread] next>

RE: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c.

from [Rik Strobbe] [Permanent Link][Original]
To: "[email protected]" <[email protected]>
Subject: RE: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c.
From: Rik Strobbe <[email protected]>
Date: Wed, 12 Oct 2011 09:30:59 +0200
Accept-language: nl-NL, nl-BE
Acceptlanguage: nl-NL, nl-BE
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <1849736542-1318171189-cardhu_decombobulator_blackberry.rim.net-208700020-@b1.c11.bise7.blackberry> <FB0006513E634A96AFED8066F7C344C1@JimPC> <[email protected]> <BA4122BA92D44641A1BE5ED27FD763E5@JimPC> <[email protected]> <[email protected]> <[email protected]> <006c01cc87ab$427234c0$4001a8c0@lark> <[email protected]> <834DCCD1D3834F4CB4C171B7C30E85B4@AGB> <004801cc8809$63378d50$4001a8c0@lark> <C141E3F03F9B47FA80F4461CE4B174BC@AGB>,<[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Thread-index: AcyIaqOa2qLKqeu3TECB76oQ8muUsgAQarKb
Thread-topic: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c.

I'm puzzled by the 6pf/metre rule for monoploes.  It seems the capacitance of the monopole is much higher.

 

Hi Joe,

 

based on a resonance with 3mH @137.8kHz the antenna capacitance would be 445pF.

A rato of 5..6pF/m you should have more or less 75..90m of wire up in the air (vertical and horizontal section).

But the given value of 5..6pF/m is only valid for thin wire. If you use very thick wire or maybe even a tower as part of the antenna the capacitance is larger. For a 1m diameter tower the capacitance can be as high as 25pF/m

 

73, Rik  ON7YD - OR7T

[More with this subject...]
<Prev in Thread] Current Thread [Next in Thread>
Previous by Date:  Re: LF: Emailing: capt02 (2), Albert
Next by Date:  Re: LF: noise on VK and earth dipole tests, John Rabson
Previous by Thread:  Re: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c., jcraig
Next by Thread:  Re: LF: VX9MRC QRV 507.77 kHz/ Arcing relays &c., Stefan Schäfer
Indexes:  [Date] [Thread] [Top] [All Lists]